经反复试验，确定了剪皱试样的形状和尺寸范围。
Repeated experiments were made to determine the proper shape and size of the specimen.
经反复试验、探索和总结，研制开发出一套SAE1141标准样品，并据此制作出发射光谱仪用持久性工作曲线，建立了快速而准确的分析方法。
By trial and research, a set of SAE1141 standard specimens were developed and a constant performance curve was given. A quick and precise analysis method was established.
我们公司的烟感探测器，是公司经多年研究，反复试验后定型生产的一种专用工具。
Our company's haze meter, is the company through years of study and repeated tests of a specialized tool for shaping the production.
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